Programming Articles - Page 1239 of 3363

Let us assume that we are creating a tkinter application where two or more widgets are placed using a grid property. We have to add some space between the widgets in order to style their appearance. To provide space in the widgets, we can use padding property, as padding adds space to the outermost part of the widget. In order to add padding, assign the values to padx and pady.Example#Import the required library from tkinter import * #create an instance of tkinter frame win= Tk() win.geometry("750x250") #Create some Button widgets Label(win, text= "New Line Text", font= ('Helvetica 20 bold')).grid(row=0, column=5, ... Read More

In various applications, tkinter widgets are required to be focused to make them active. Widgets can also grab focus and prevent the other events outside the bounds. To manage and give focus to a particular widget, we generally use the focus_set() method. It focuses the widget and makes them active until the termination of the program.ExampleIn the following example, we have created two widgets: an Entry widget and a text widget in the same window. By using the focus_set() method, we will activate the focus on the text widget.#Import tkinter library from tkinter import * from PIL import Image, ImageTk ... Read More

Tkinter initially creates an instance of a window which is a container that contains all the widgets and the elements. If we want to resize the window, we can use the geometry method by defining the value of width and height.In order to get the width and height of the tkinter window, we can use winfo_width() and winfo_height() helper methods that help to grab the current width and height of the tkinter window.Example# Import tkinter library from tkinter import * # Create an instance of tkinter frame win = Tk() # Set the Geometry win.geometry("750x250") def print_width():    print("The width ... Read More

Tkinter provides a variety of input widgets such as entry widget, text widget, listbox, combobox, spinbox, checkbox, etc. Checkboxes are used for taking validity input and the state gets active whenever the user clicks on the checkbutton. In terms of a particular application, we can check the state of the tkinter CheckButtons by using the state() method. It prints the actual state of the tkinter checkbuttons.Example#Import the required library from tkinter import* from tkinter import ttk #Create an instance of tkinter frame win= Tk() #Set the geometry win.geometry("750x250") #Define geometry of the window win.geometry("750x250") #Create CheckButtons chk= ttk.Checkbutton(win, text="Python") chk.pack() ... Read More

When it is required to copy all the elements from one array to another, an empty array with ‘None’ elements is created. A simple for loop is used to iterate over the elements, and the ‘=’ operator is used to assign values to the new list.Below is a demonstration of the same −Example Live Demomy_list_1 = [34, 56, 78, 90, 11, 23] my_list_2 = [None] * len(my_list_1) for i in range(0, len(my_list_1)):    my_list_2[i] = my_list_1[i] print("The list is : ") for i in range(0, len(my_list_1)): print(my_list_1[i]) print() print("The new list : ") for i in ... Read More

When it is required to construct a binary tree, and perform operations such as inserting an element, deleting an element and displaying elements of the tree, a class is defined with methods in it. An instance of the class is defined and this is used to access the elements and perform operations.Below is a demonstration of the same −Example Live Democlass Tree_struct:    def __init__(self, data=None, parent=None):       self.key = data       self.children = []       self.parent = parent    def set_root(self, data):       self.key = data    def add_node(self, node): ... Read More

When it is required to check if a number has consecutive zeroes of a specific base, a method is defined, that takes the number and base as parameters, and uses another method to return Yes or No depending on whether the base is present or not.Below is a demonstration of the same −Example Live Demodef check_consecutive_zero(N, K):    my_result = convert_to_base(N, K)    if (check_n(my_result)):       print("Yes")    else:       print("No") def convert_to_base(N, K):    weight = 1    s = 0    while (N != 0):       r = N % K   ... Read More

The child window can be referred to as the independent window which is separated from the root or main window. In order to create a child window, we have to define a toplevel window which can be created manually using the Toplevel(win) method. In the method toplevel(root), we have to pass the main window as the parameter and further define the widgets if needed.ExampleLet us create a child window which contains some widgets in it.#Import tkinter library from tkinter import * from tkinter import ttk #Create an instance of tkinter frame win = Tk() #Set the geometry and title of ... Read More

When it is required to implement a queue using Python, a queue class is created, and methods to add and delete elements are defined. An instance of the class is created, and these methods are called using the instance and relevant output is displayed.Below is a demonstration of the same −Example Live Democlass Queue_struct:    def __init__(self):       self.items = []    def check_empty(self):       return self.items == []    def enqueue_elem(self, data):       self.items.append(data)    def dequeue_elem(self):       return self.items.pop(0) my_instance = Queue_struct() while True:    print('Enqueue ') ... Read More

When it is required to implement a stack using Python, a stack class is created, and an instance of this class is created. Methods to push, pop elements are defined and the instance is used to call these methods.Below is a demonstration of the same −Example Live Democlass Stack_struct:    def __init__(self):       self.items = []    def check_empty(self):       return self.items == []    def add_elements(self, my_data):       self.items.append(my_data)    def delete_elements(self):       return self.items.pop() my_instance = Stack_struct() while True:    print('Push ')    print('Pop')    print('Quit')   ... Read More